US7755847B2 - Zoom lens system, imaging device and camera - Google Patents
Zoom lens system, imaging device and camera Download PDFInfo
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- US7755847B2 US7755847B2 US12/127,297 US12729708A US7755847B2 US 7755847 B2 US7755847 B2 US 7755847B2 US 12729708 A US12729708 A US 12729708A US 7755847 B2 US7755847 B2 US 7755847B2
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/177—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a negative front lens or group of lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/143—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only
- G02B15/1435—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being negative
- G02B15/143507—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being negative arranged -++
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/64—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image
- G02B27/646—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image compensating for small deviations, e.g. due to vibration or shake
Definitions
- the present invention relates to a zoom lens system, an imaging device and a camera.
- the present invention relates to: a zoom lens system that has a remarkably reduced thickness at the time of accommodation so as to be suitable for a lens barrel of so-called retraction type and that is still provided with a wide view angle at a wide-angle limit and with a zooming ratio exceeding 3.2; an imaging device employing this zoom lens system; and a thin and compact camera employing this imaging device.
- zoom lens systems suitable for the above-mentioned digital cameras for example, the following zoom lens systems are proposed.
- Japanese Laid-Open Patent Publication No. 2005-331860 discloses a variable magnification optical system, in order from the object side, including a first lens unit having negative optical power and a second lens unit having positive optical power, wherein: at the time of magnification change from a wide-angle limit to a telephoto limit, the interval between the first and the second lens units is reduced; the first lens unit is composed of two or more lenses; and at least three lens units are each composed solely of a single lens or a cemented lens.
- Japanese Laid-Open Patent Publication No. 2006-011096 discloses a variable magnification optical system, in order from the object side, including a first lens unit having negative optical power and a second lens unit having positive optical power each composed of a plurality of lenses, wherein: at the time of magnification change from a wide-angle limit to a telephoto limit, the interval between the first and the second lens units is reduced; the first lens unit has at least one aspheric surface; and a predetermined condition is satisfied by all of the maximum of the refractive index difference (absolute value) of the two lenses in the first lens unit, the composite focal length of the second lens unit, and the optical axial distance from the surface vertex of the most-image-sensor-side lens surface to the image sensor surface at a telephoto limit.
- Japanese Laid-Open Patent Publication No. 2006-023679 discloses a zoom lens, in order from the object side to the image side, comprising a first lens unit having negative refractive power and a second lens unit having positive refractive power, wherein: the interval between the two lens units varies during the zooming; the first lens unit comprises a lens 11 having negative refractive power and a lens 12 having positive refractive power; the second lens unit comprises a lens 21 having positive refractive power and a lens 22 having negative refractive power; and the Abbe numbers of the lens 21 and the lens 22 satisfy a predetermined condition.
- Japanese Laid-Open Patent Publication No. 2006-065034 discloses a zoom lens, in order from the object side to the image side, comprising a first lens unit having negative refractive power, a second lens unit having positive refractive power and a third lens unit having positive refractive power, wherein: the intervals between the individual lens units vary during the zooming; the first lens unit is composed of one negative lens and one positive lens; the second lens unit comprises a second-a lens unit composed of one positive lens and one negative lens and a second-b lens unit that is arranged on the image side of the second-a lens unit and that has at least one positive lens; the third lens unit has at least one positive lens; and a predetermined condition is satisfied by the image magnifications at a wide-angle limit and a telephoto limit of the second lens unit, the interval between the first and the second lens units at a wide-angle limit, and the interval between the second and the third lens units at a telephoto limit.
- Japanese Laid-Open Patent Publication No. 2006-084829 discloses a zoom lens, in order from the object side to the image side, comprising a first lens unit having negative refractive power, a second lens unit having positive refractive power and a third lens unit having positive refractive power, wherein: the intervals between the individual lens units vary during the zooming; the second lens unit comprises a second-a lens unit composed of, in order from the object side to the image side, a positive lens and a negative lens and a second-b lens unit that is arranged on the image side of the second-a lens unit and that has at least one positive lens; and a predetermined condition is satisfied by the half view angle at a wide-angle limit, the focal lengths of the first and the second lens units and the focal length of the entire system at a wide-angle limit.
- Japanese Laid-Open Patent Publication No. 2006-139187 discloses a zoom lens, in order from the object side, comprising a first lens unit having negative refractive power, a second lens unit having positive refractive power and a third lens unit having positive refractive power, wherein: the intervals between the individual lens units are changed so that variable magnification is achieved; the second lens unit is composed of two lens components consisting of a single lens on the object side and a lens component on the image side; and a predetermined condition is satisfied by the radii of curvature of the single lens on the object side and the image side and the lens optical axial thickness of the single lens.
- Japanese Laid-Open Patent Publication No. 2006-171421 discloses a zoom lens, in order from the object side to the image side, comprising a first lens unit having negative refractive power, a second lens unit having positive refractive power and a third lens unit having positive refractive power, wherein: the intervals between the individual lens units vary during the zooming; the first lens unit, in order from the object side to the image side, comprises one negative lens and one positive lens; the second lens unit, in order from the object side to the image side, comprises a positive lens, a positive lens, a negative lens and a positive lens; and during the zooming from a wide-angle limit to a telephoto limit, the third lens unit moves to the image side.
- Japanese Laid-Open Patent Publication No. 2006-208890 discloses a zoom lens, in order from the object side to the image side, comprising a first lens unit having negative refractive power, a second lens unit having positive refractive power and a third lens unit having positive refractive power, wherein: the intervals between the individual lens units vary during the zooming; and a predetermined condition is satisfied by the amount of movement of the second lens unit during the zooming from a wide-angle limit to a telephoto limit, the interval between the second and the third lens units at a wide-angle limit, the focal lengths of the first and the second lens units and the focal length of the entire system at a wide-angle limit.
- Japanese Laid-Open Patent Publication No. 2006-350027 discloses a zoom lens, in order from the object side, comprising at least a first lens unit composed of two components and a second lens unit composed of one component, wherein: at the time of magnification change, at least the interval between the first and the second lens units varies; the first and the second lens units have aspheric surfaces; and a predetermined condition is satisfied by the paraxial radius of curvature of at least one aspheric surface A of the first lens unit and the distance between the intersecting point where the most off-axis principal ray passes through the aspheric surface A and the optical axis.
- Japanese Laid-Open Patent Publication No. 2006-194974 discloses a zoom lens, in order from the object side to the image side, comprising a first lens unit having negative refractive power and a second lens unit having positive refractive power, wherein: the interval between the individual units is changed so that magnification change from a wide-angle limit to a telephoto limit is achieved; the first lens unit is, in order from the object side, composed of two lenses consisting of a negative lens and a positive lens; and a predetermined condition is satisfied by the Abbe number of the positive lens, the refractive index of the positive lens and the refractive index of the negative lens.
- Japanese Laid-Open Patent Publication No. 2006-220715 discloses a zoom lens, in order from the object side, comprising a first lens unit having negative refractive power, a second lens unit having positive refractive power and a third lens unit having positive refractive power, wherein: the intervals between the individual lens units are changed so that variable magnification is achieved; the first lens unit is composed of two lenses consisting of a negative lens and a positive lens; the second lens unit comprises two positive lenses and one negative lens; the third lens unit is composed of one positive lens; and a predetermined condition is satisfied by the refractive index of the negative lens and the refractive index of the positive lens in the first lens unit.
- optical systems disclosed in the above-mentioned publications have zooming ratios sufficient for application to digital cameras. Nevertheless, width of the view angle at a wide-angle limit and size reduction are not simultaneously realized. In particular, from the viewpoint of size reduction, requirements in digital cameras of recent years are not satisfied.
- An object of the present invention is to realize: a zoom lens system that has a remarkably reduced thickness at the time of accommodation so as to be suitable for a lens barrel of so-called retraction type and that is still provided with a wide view angle at a wide-angle limit and with a zooming ratio of 3 or the like; an imaging device employing this zoom lens system; and a thin and compact camera employing this imaging device.
- a zoom lens system in order from the object side to the image side, comprising a first lens unit having negative optical power, a second lens unit having positive optical power and a third lens unit having positive optical power, wherein
- the first lens unit is composed of two lens elements, in order from the object side to the image side, comprising a first lens element that has a concave surface at least on the image side and that has negative optical power and a second lens element that has a convex surface at least on the object side and that has positive optical power,
- the second lens unit in order from the object side to the image side, comprises a third lens element being one single lens element, a cemented lens element fabricated by cementing a fourth lens element and a fifth lens element having optical power of mutually different signs, and a sixth lens element being one single lens element,
- all of the first lens unit, the second lens unit and the third lens unit move along an optical axis
- ⁇ i W is an incident angle of a principal ray to an image sensor at a maximum image height at a wide-angle limit (defined as positive when the principal ray is incident on a light acceptance surface of the image sensor in a state of departing from the optical axis),
- n 11 is a refractive index of the first lens element to the d-line
- ⁇ W is a half view angle (°) at a wide-angle limit
- f T is a focal length of the entire system at a telephoto limit
- f W is a focal length of the entire system at a wide-angle limit.
- an imaging device capable of outputting an optical image of an object as an electric image signal comprising:
- the system in order from the object side to the image side, comprises a first lens unit having negative optical power, a second lens unit having positive optical power and a third lens unit having positive optical power, wherein
- the first lens unit is composed of two lens elements, in order from the object side to the image side, comprising a first lens element that has a concave surface at least on the image side and that has negative optical power and a second lens element that has a convex surface at least on the object side and that has positive optical power,
- the second lens unit in order from the object side to the image side, comprises a third lens element being one single lens element, a cemented lens element fabricated by cementing a fourth lens element and a fifth lens element having optical power of mutually different signs, and a sixth lens element being one single lens element,
- all of the first lens unit, the second lens unit and the third lens unit move along an optical axis
- ⁇ i W is an incident angle of a principal ray to an image sensor at a maximum image height at a wide-angle limit (defined as positive when the principal ray is incident on a light acceptance surface of the image sensor in a state of departing from the optical axis),
- n 11 is a refractive index of the first lens element to the d-line
- ⁇ W is a half view angle (°) at a wide-angle limit
- f T is a focal length of the entire system at a telephoto limit
- f W is a focal length of the entire system at a wide-angle limit.
- a camera for converting an optical image of an object into an electric image signal and then performing at least one of displaying and storing of the converted image signal, comprising
- an imaging device having a zoom lens system that forms the optical image of the object and an image sensor that converts the optical image formed by the zoom lens system into the electric image signal, wherein
- the system in order from the object side to the image side, comprises a first lens unit having negative optical power, a second lens unit having positive optical power and a third lens unit having positive optical power, wherein
- the first lens unit is composed of two lens elements, in order from the object side to the image side, comprising a first lens element that has a concave surface at least on the image side and that has negative optical power and a second lens element that has a convex surface at least on the object side and that has positive optical power,
- the second lens unit in order from the object side to the image side, comprises a third lens element being one single lens element, a cemented lens element fabricated by cementing a fourth lens element and a fifth lens element having optical power of mutually different signs, and a sixth lens element being one single lens element,
- all of the first lens unit, the second lens unit and the third lens unit move along an optical axis
- ⁇ i W is an incident angle of a principal ray to an image sensor at a maximum image height at a wide-angle limit (defined as positive when the principal ray is incident on a light acceptance surface of the image sensor in a state of departing from the optical axis),
- n 11 is a refractive index of the first lens element to the d-line
- ⁇ W is a half view angle (°) at a wide-angle limit
- f T is a focal length of the entire system at a telephoto limit
- f W is a focal length of the entire system at a wide-angle limit.
- a zoom lens system in order from the object side to the image side, comprising a first lens unit having negative optical power, a second lens unit having positive optical power and a third lens unit having positive optical power, wherein
- the first lens unit is composed of two lens elements, in order from the object side to the image side, comprising a first lens element that has a concave surface at least on the image side and that has negative optical power and a second lens element that has a convex surface at least on the object side and that has positive optical power,
- the second lens unit in order from the object side to the image side, comprises a third lens element being one single lens element, a cemented lens element fabricated by cementing a fourth lens element and a fifth lens element having optical power of mutually different signs, and a sixth lens element being one single lens element,
- all of the first lens unit, the second lens unit and the third lens unit move along an optical axis
- ⁇ i W is an incident angle of a principal ray to an image sensor at a maximum image height at a wide-angle limit (defined as positive when the principal ray is incident on a light acceptance surface of the image sensor in a state of departing from the optical axis),
- n 11 is a refractive index of the first lens element to the d-line
- n 12 is a refractive index of the second lens element to the d-line
- ⁇ W is a half view angle (°) at a wide-angle limit
- f T is a focal length of the entire system at a telephoto limit
- f W is a focal length of the entire system at a wide-angle limit.
- an imaging device capable of outputting an optical image of an object as an electric image signal comprising:
- the system in order from the object side to the image side, comprises a first lens unit having negative optical power, a second lens unit having positive optical power and a third lens unit having positive optical power, wherein
- the first lens unit is composed of two lens elements, in order from the object side to the image side, comprising a first lens element that has a concave surface at least on the image side and that has negative optical power and a second lens element that has a convex surface at least on the object side and that has positive optical power,
- the second lens unit in order from the object side to the image side, comprises a third lens element being one single lens element, a cemented lens element fabricated by cementing a fourth lens element and a fifth lens element having optical power of mutually different signs, and a sixth lens element being one single lens element,
- all of the first lens unit, the second lens unit and the third lens unit move along an optical axis
- ⁇ i W is an incident angle of a principal ray to an image sensor at a maximum image height at a wide-angle limit (defined as positive when the principal ray is incident on a light acceptance surface of the image sensor in a state of departing from the optical axis),
- n 11 is a refractive index of the first lens element to the d-line
- n 12 is a refractive index of the second lens element to the d-line
- ⁇ W is a half view angle (°) at a wide-angle limit
- f T is a focal length of the entire system at a telephoto limit
- f W is a focal length of the entire system at a wide-angle limit.
- a camera for converting an optical image of an object into an electric image signal and then performing at least one of displaying and storing of the converted image signal, comprising
- an imaging device having a zoom lens system that forms the optical image of the object and an image sensor that converts the optical image formed by the zoom lens system into the electric image signal, wherein
- the system in order from the object side to the image side, comprises a first lens unit having negative optical power, a second lens unit having positive optical power and a third lens unit having positive optical power, wherein
- the first lens unit is composed of two lens elements, in order from the object side to the image side, comprising a first lens element that has a concave surface at least on the image side and that has negative optical power and a second lens element that has a convex surface at least on the object side and that has positive optical power,
- the second lens unit in order from the object side to the image side, comprises a third lens element being one single lens element, a cemented lens element fabricated by cementing a fourth lens element and a fifth lens element having optical power of mutually different signs, and a sixth lens element being one single lens element,
- all of the first lens unit, the second lens unit and the third lens unit move along an optical axis
- ⁇ i W is an incident angle of a principal ray to an image sensor at a maximum image height at a wide-angle limit (defined as positive when the principal ray is incident on a light acceptance surface of the image sensor in a state of departing from the optical axis),
- n 11 is a refractive index of the first lens element to the d-line
- n 12 is a refractive index of the second lens element to the d-line
- ⁇ W is a half view angle (°) at a wide-angle limit
- f T is a focal length of the entire system at a telephoto limit
- f W is a focal length of the entire system at a wide-angle limit.
- a zoom lens system in order from the object side to the image side, comprising a first lens unit having negative optical power, a second lens unit having positive optical power and a third lens unit having positive optical power, wherein
- the first lens unit is composed of two lens elements, in order from the object side to the image side, comprising a first lens element that has a concave surface at least on the image side and that has negative optical power and a second lens element that has a convex surface at least on the object side and that has positive optical power,
- the second lens unit in order from the object side to the image side, comprises a third lens element being one single lens element, a cemented lens element fabricated by cementing a fourth lens element and a fifth lens element having optical power of mutually different signs, and a sixth lens element being one single lens element,
- all of the first lens unit, the second lens unit and the third lens unit move along an optical axis
- ⁇ i W is an incident angle of a principal ray to an image sensor at a maximum image height at a wide-angle limit (defined as positive when the principal ray is incident on a light acceptance surface of the image sensor in a state of departing from the optical axis),
- n 12 is a refractive index of the second lens element to the d-line
- ⁇ W is a half view angle (°) at a wide-angle limit
- f T is a focal length of the entire system at a telephoto limit
- f W is a focal length of the entire system at a wide-angle limit.
- an imaging device capable of outputting an optical image of an object as an electric image signal comprising:
- the system in order from the object side to the image side, comprises a first lens unit having negative optical power, a second lens unit having positive optical power and a third lens unit having positive optical power, wherein
- the first lens unit is composed of two lens elements, in order from the object side to the image side, comprising a first lens element that has a concave surface at least on the image side and that has negative optical power and a second lens element that has a convex surface at least on the object side and that has positive optical power,
- the second lens unit in order from the object side to the image side, comprises a third lens element being one single lens element, a cemented lens element fabricated by cementing a fourth lens element and a fifth lens element having optical power of mutually different signs, and a sixth lens element being one single lens element,
- all of the first lens unit, the second lens unit and the third lens unit move along an optical axis
- ⁇ i W is an incident angle of a principal ray to an image sensor at a maximum image height at a wide-angle limit (defined as positive when the principal ray is incident on a light acceptance surface of the image sensor in a state of departing from the optical axis),
- n 12 is a refractive index of the second lens element to the d-line
- ⁇ W is a half view angle (°) at a wide-angle limit
- f T is a focal length of the entire system at a telephoto limit
- f W is a focal length of the entire system at a wide-angle limit.
- a camera for converting an optical image of an object into an electric image signal and then performing at least one of displaying and storing of the converted image signal, comprising
- an imaging device having a zoom lens system that forms the optical image of the object and an image sensor that converts the optical image formed by the zoom lens system into the electric image signal, wherein
- the system in order from the object side to the image side, comprises a first lens unit having negative optical power, a second lens unit having positive optical power and a third lens unit having positive optical power, wherein
- the first lens unit is composed of two lens elements, in order from the object side to the image side, comprising a first lens element that has a concave surface at least on the image side and that has negative optical power and a second lens element that has a convex surface at least on the object side and that has positive optical power,
- the second lens unit in order from the object side to the image side, comprises a third lens element being one single lens element, a cemented lens element fabricated by cementing a fourth lens element and a fifth lens element having optical power of mutually different signs, and a sixth lens element being one single lens element,
- all of the first lens unit, the second lens unit and the third lens unit move along an optical axis
- ⁇ i W is an incident angle of a principal ray to an image sensor at a maximum image height at a wide-angle limit (defined as positive when the principal ray is incident on a light acceptance surface of the image sensor in a state of departing from the optical axis),
- n 12 is a refractive index of the second lens element to the d-line
- ⁇ W is a half view angle (°) at a wide-angle limit
- f T is a focal length of the entire system at a telephoto limit
- f W is a focal length of the entire system at a wide-angle limit.
- the present invention can provide a zoom lens system that has a remarkably reduced thickness at the time of accommodation so as to be suitable for a lens barrel of so-called retraction type and that is still provided with a wide view angle at a wide-angle limit and with a zooming ratio exceeding 3.2. Further, according to the present invention, an imaging device employing this zoom lens system and a thin and compact camera employing this imaging device can be provided.
- FIGS. 1 a - 1 c are lens arrangement diagrams showing an infinity in-focus condition of a zoom lens system according to Embodiments I-1, II-1 and III-1 (Examples I-1, II-1 and III-1);
- FIGS. 2 a - 2 c are longitudinal aberration diagrams showing an infinity in-focus condition of a zoom lens system according to Examples I-1, II-1 and III-1;
- FIG. 3 is a lateral aberration diagram in a basic state where image blur compensation is not performed and in an image blur compensation state at a telephoto limit of a zoom lens system according to Examples I-1, II-1 and III-1;
- FIGS. 4 a - 4 c are lens arrangement diagrams showing an infinity in-focus condition of a zoom lens system according to Embodiments I-2, II-2 and III-2 (Examples I-2, II-2 and III-2);
- FIGS. 5 a - 5 c are longitudinal aberration diagrams showing an infinity in-focus condition of a zoom lens system according to Examples I-2, II-2 and III-2;
- FIG. 6 is a lateral aberration diagram in a basic state where image blur compensation is not performed and in an image blur compensation state at a telephoto limit of a zoom lens system according to Examples I-2, II-2 and III-2;
- FIG. 7 is a schematic configuration diagram of a digital still camera according to Embodiments I-3, II-3 and III-3.
- FIG. 1 is a lens arrangement diagram of a zoom lens system according to Embodiments I-1, II-1 and III-1.
- FIG. 4 is a lens arrangement diagram of a zoom lens system according to Embodiments I-2, II-2 and III-2.
- FIGS. 1 and 4 show respectively a zoom lens system in an infinity in-focus condition.
- part (a) shows a lens configuration at a wide-angle limit (in the minimum focal length condition: focal length f W )
- part (c) shows a lens configuration at a telephoto limit (in the maximum focal length condition: focal length f T ).
- straight or curved arrows provided between part (a) and part (b) show the movement of each lens unit from the wide-angle limit to the telephoto limit through the middle position.
- an arrow provided to a lens unit indicates focusing from an infinity in-focus condition to a close-object focusing state, that is, the moving direction at the time of focusing from an infinity in-focus condition to a close-object focusing state.
- the zoom lens system according to each embodiment in order from the object side to the image side, comprises a first lens unit G 1 having negative optical power, a second lens unit G 2 having positive optical power and a third lens unit G 3 having positive optical power. Then, in zooming from a wide-angle limit to a telephoto limit, the first lens unit G 1 , the second lens unit G 2 and the third lens unit G 3 all move along the optical axis (this lens configuration is referred to as the basic configuration of the embodiments, hereinafter).
- these lens units are arranged into a desired optical power arrangement, so that a zooming ratio exceeding 3.2 and high optical performance are achieved and still size reduction is realized in the entire lens system.
- an asterisk “*” provided to a particular surface indicates that the surface is aspheric.
- a symbol (+) or ( ⁇ ) provided to the sign of each lens unit corresponds to the sign of optical power of the lens unit.
- the straight line located on the most right-hand side indicates the position of an image surface S.
- two plane parallel plates such as optical low-pass filters and face plates of an image sensor are provided.
- a diaphragm A is provided between the most image side lens surface of the first lens unit G 1 and each of the most object side lens surfaces of the second lens unit G 2 .
- the first lens unit G 1 in order from the object side to the image side, comprises: a negative meniscus first lens element L 1 with the convex surface facing the object side; and a positive meniscus second lens element L 2 with the convex surface facing the object side.
- the first lens element L 1 has a refractive index to the d-line as high as 1.9 or greater.
- the first lens unit G 1 in order from the object side to the image side, comprises: a negative meniscus first lens element L 1 with the convex surface facing the object side; and a positive meniscus second lens element L 2 with the convex surface facing the object side.
- the first lens element L 1 and the second lens element L 2 have high refractive indices to the d-line.
- the first lens unit G 1 in order from the object side to the image side, comprises: a negative meniscus first lens element L 1 with the convex surface facing the object side; and a positive meniscus second lens element L 2 with the convex surface facing the object side.
- the second lens element L 2 has a refractive index to the d-line as high as 2.1 or greater.
- the second lens unit G 2 in order from the object side to the image side, comprises: a positive meniscus third lens element L 3 with the convex surface facing the object side; a bi-convex fourth lens element L 4 ; a bi-concave fifth lens element L 5 ; and a bi-convex sixth lens element L 6 .
- the fourth lens element L 4 and the fifth lens element L 5 are cemented with each other.
- the third lens unit G 3 comprises solely a bi-convex seventh lens element L 7 .
- parallel plates L 8 and L 9 are, in order from the object side to the image side, provided on the object side relative to the image surface S (between the image surface S and the seventh lens element L 7 ).
- the first lens unit G 1 moves with locus of a convex to the image side with changing the interval with the second lens unit G 2 , while the second lens unit G 2 moves to the object side, and while the third lens unit G 3 moves to the image side.
- the zoom lens system according to Embodiment I-1 in particular, as shown later in Table I-7, the first lens element L 1 that constitutes the first lens unit G 1 and that has a concave surface on the image side and negative optical power is provided with a high refractive index.
- the lens thickness especially, the edge thickness, can be reduced. Accordingly, the zoom lens system according to Embodiment I-1 has a reduced overall optical length at the time of non-use.
- the first lens element L 1 having a concave surface on the image side and negative optical power and the second lens element L 2 having a convex surface on the object side and positive optical power, which constitute the first lens unit G 1 have high refractive indices.
- the optical axial lens thicknesses of these lens elements can be reduced, while the radii of curvature of the lenses can be increased.
- control of the Petzval sum becomes easy. This permits appropriate compensation of curvature of field.
- aberration compensation can be performed without the necessity of using a surface having a small radius of curvature and hence strong optical power. This permits easy compensation of off-axial aberration, especially, distortion and astigmatism at a wide-angle limit, which easily causes a problem especially in a zoom lens system having a wide view angle at a wide-angle limit.
- the zoom lens system according to Embodiment III-1 in particular, as shown later in Table III-7, the second lens element L 2 that constitutes the first lens unit G 1 and that has a convex surface on the object side and positive optical power is provided with a remarkably high refractive index.
- the optical axial lens thickness can be reduced, while the radius of curvature of the lens can be increased. Accordingly, the zoom lens system according to Embodiment III-1 has a reduced overall optical length at the time of non-use.
- the second lens unit G 2 comprises: a third lens element L 3 being a single lens element; a cemented lens element fabricated by cementing a fourth lens element L 4 having positive optical power and a fifth lens element L 5 having negative optical power; and a sixth lens element L 6 being a single lens element.
- the object side surfaces of the third lens element L 3 and the fourth lens element L 4 are convex and the image side surface of the fifth lens element L 5 is concave. According to this configuration, axial spherical aberration and off-axial coma aberration can simultaneously be compensated satisfactory.
- the first lens unit G 1 in order from the object side to the image side, comprises: a negative meniscus first lens element L 1 with the convex surface facing the object side; and a positive meniscus second lens element L 2 with the convex surface facing the object side.
- the first lens element L 1 has a refractive index to the d-line as high as 1.9 or greater.
- the first lens unit G 1 in order from the object side to the image side, comprises: a negative meniscus first lens element L 1 with the convex surface facing the object side; and a positive meniscus second lens element L 2 with the convex surface facing the object side.
- the first lens element L 1 and the second lens element L 2 have high refractive indices to the d-line.
- the first lens unit G 1 in order from the object side to the image side, comprises: a negative meniscus first lens element L 1 with the convex surface facing the object side; and a positive meniscus second lens element L 2 with the convex surface facing the object side.
- the second lens element L 2 has a refractive index to the d-line as high as 2.1 or greater.
- the second lens unit G 2 in order from the object side to the image side, comprises: a positive meniscus third lens element L 3 with the convex surface facing the object side; a bi-convex fourth lens element L 4 ; a bi-concave fifth lens element L 5 ; and a bi-convex sixth lens element L 6 .
- the fourth lens element L 4 and the fifth lens element L 5 are cemented with each other.
- the third lens unit G 3 comprises solely a bi-convex seventh lens element L 7 .
- parallel plates L 8 and L 9 are, in order from the object side to the image side, provided on the object side relative to the image surface S (between the image surface S and the seventh lens element L 7 ).
- the first lens unit G 1 moves with locus of a convex to the image side with changing the interval with the second lens unit G 2 , while the second lens unit G 2 moves to the object side, and while the third lens unit G 3 moves to the image side.
- the zoom lens system according to Embodiment I-2 in particular, as shown later in Table I-7, the first lens element L 1 that constitutes the first lens unit G 1 and that has a concave surface on the image side and negative optical power is provided with a high refractive index.
- the lens thickness especially, the edge thickness, can be reduced. Accordingly, the zoom lens system according to Embodiment I-2 has a reduced overall optical length at the time of non-use.
- the first lens element L 1 having a concave surface on the image side and negative optical power and the second lens element L 2 having a convex surface on the object side and positive optical power, which constitute the first lens unit G 1 have high refractive indices.
- the optical axial lens thicknesses of these lens elements can be reduced, while the radii of curvature of the lenses can be increased.
- control of the Petzval sum becomes easy. This permits appropriate compensation of curvature of field.
- aberration compensation can be performed without the necessity of using a surface having a small radius of curvature and hence strong optical power. This permits easy compensation of off-axial aberration, especially, distortion and astigmatism at a wide-angle limit, which easily causes a problem especially in a zoom lens system having a wide view angle at a wide-angle limit.
- the zoom lens system according to Embodiment III-2 in particular, as shown later in Table III-7, the second lens element L 2 that constitutes the first lens unit G 1 and that has a convex surface on the object side and positive optical power is provided with a remarkably high refractive index.
- the optical axial lens thickness can be reduced, while the radius of curvature of the lens can be increased. Accordingly, the zoom lens system according to Embodiment III-2 has a reduced overall optical length at the time of non-use.
- the second lens unit G 2 comprises: a third lens element L 3 being a single lens element; a cemented lens element fabricated by cementing a fourth lens element L 4 having positive optical power and a fifth lens element L 5 having negative optical power; and a sixth lens element L 6 being a single lens element.
- the object side surfaces of the third lens element L 3 and the fourth lens element L 4 are convex and the image side surface of the fifth lens element L 5 is concave. According to this configuration, axial spherical aberration and off-axial coma aberration can simultaneously be compensated satisfactory.
- the first lens unit G 1 , the second lens unit G 2 and the third lens unit G 3 all move along the optical axis. Also, among these lens units, for example, the second lens unit G 2 is moved in a direction perpendicular to the optical axis, so that image blur caused by hand blurring, vibration and the like can be compensated optically.
- the second lens unit moves in a direction perpendicular to the optical axis as described above, so that image blur is compensated in a state that size increase in the entire zoom lens system is suppressed and a compact construction is realized and that excellent imaging characteristics such as small decentering coma aberration and decentering astigmatism are satisfied.
- ⁇ W is a half view angle (°) at a wide-angle limit
- f T is a focal length of the entire system at a telephoto limit
- f W is a focal length of the entire system at a wide-angle limit.
- condition (B) is replaced by the following condition (B)′, the effect obtained by virtue of each condition described below is achieved more successfully.
- ⁇ i W is an incident angle of a principal ray to an image sensor at a maximum image height at a wide-angle limit (defined as positive when the principal ray is incident on a light acceptance surface of the image sensor in a state of departing from the optical axis).
- the condition (1) sets forth the incident angle of the principal ray to the image sensor at the maximum image height at a wide-angle limit.
- the incident angle at which the most off-axis principal ray enters the image sensor becomes small. This reduces the influence of shading.
- the influence of shading in the image sensor reduces the amount of periphery light.
- the angle of the negative most off-axis principal ray at a telephoto limit becomes large at the time of magnification change. This reduces the amount of periphery light especially a telephoto limit.
- n 11 is a refractive index of the first lens element to the d-line.
- the condition (I-2) sets forth the refractive index of the first lens element.
- the condition (I-2) is satisfied, the center thickness of the first lens element is reduced. Further, even when the curvature, especially, the curvature on the image side, is not increased, curvature of field on the wide-angle side is suppressed. Further, when the condition (I-2) is satisfied, a shape can be ensured that is effective especially for compensation of distortion and astigmatism at a wide-angle limit.
- n 11 is a refractive index of the first lens element to the d-line.
- the condition (I-3) sets forth the refractive index of the first lens element.
- the condition (I-3) is satisfied, the center thickness of the first lens element is reduced. Further, even when the curvature, especially, the curvature on the image side, is not increased, curvature of field on the wide-angle side is suppressed. Further, when the condition (I-3) is satisfied, a shape can be ensured that is effective especially for compensation of distortion and astigmatism at a wide-angle limit.
- the image side surface is made aspheric. When the image side surface of the first lens element is made aspheric, off-axial aberration, especially, distortion and astigmatism at a wide-angle limit, can be compensated effectively.
- r 12 is a radius of curvature of the image side surface of the first lens element
- n 11 is a refractive index of the first lens element to the d-line
- f W is a focal length of the entire system at a wide-angle limit.
- the condition (I-4) sets forth the refractive index of the first lens element.
- the value exceeds the upper limit of the condition (I-4) the radius of curvature of the image side surface of the first lens element becomes excessively small, and hence fabrication becomes difficult. Thus, this situation is not preferable.
- the value goes below the lower limit of the condition (I-4) the optical power of the image side surface of the first lens element becomes excessively weak.
- compensation of the above-mentioned off-axial aberration, especially, distortion and astigmatism at a wide-angle limit becomes insufficient. Accordingly, this situation is not preferable.
- the image side surface of the first lens element is made aspheric.
- off-axial aberration, especially, distortion and astigmatism at a wide-angle limit can be compensated effectively.
- n 11 is a refractive index of the first lens element to the d-line
- n 12 is a refractive index of the second lens element to the d-line.
- the condition (II-2) sets forth the refractive indices of the first lens element and the second lens element.
- the condition (II-2) is satisfied, the optical axial lens thicknesses of these lens elements can be reduced, while the radii of curvature of the lenses can be increased.
- control of the Petzval sum by means of reducing the refractive index difference of these lens elements becomes easy.
- adjustment is performed such that the range of the condition (II-2) should not be exceeded.
- the first lens element satisfies the above-mentioned condition (II-2) and simultaneously has an aspheric image side surface and that the second lens element satisfies the above-mentioned condition (II-2) and simultaneously has an aspheric object side surface.
- the two opposing surfaces of the first lens element and the second lens element are made aspheric, off-axial aberration, especially, distortion and astigmatism at a wide-angle limit, can be compensated effectively.
- n 12 is a refractive index of the second lens element to the d-line.
- the condition (III-2) sets forth the refractive index of the second lens element.
- the condition (III-2) is satisfied, the center thickness of the second lens element is reduced. Further, even when the curvature, especially, the curvature on the object side, is not increased, curvature of field on the wide-angle side is suppressed. Further, when the condition (III-2) is satisfied, a shape can be ensured that is effective especially for compensation of distortion and astigmatism at a wide-angle limit.
- n 12 is a refractive index of the second lens element to the d-line.
- the condition (III-3) sets forth the refractive index of the second lens element.
- the condition (III-3) is satisfied, the center thickness of the second lens element is reduced. Further, even when the curvature, especially, the curvature on the image side, is not increased, curvature of field on the wide-angle side is suppressed. Further, when the condition (III-3) is satisfied, a shape can be ensured that is effective especially for compensation of distortion and astigmatism at a wide-angle limit.
- the object side surface is made aspheric. When the object side surface of the second lens element is made aspheric, off-axial aberration, especially, distortion and astigmatism at a wide-angle limit, can be compensated effectively.
- r 21 is a radius of curvature of the object side surface of the second lens element
- n 12 is a refractive index of the second lens element to the d-line
- f W is a focal length of the entire system at a wide-angle limit.
- the condition (III-4) sets forth the refractive index of the second lens element.
- the condition (III-4) is satisfied, the center thickness of the second lens element is reduced. Further, even when the curvature, especially, the curvature on the image side, is not increased, curvature of field on the wide-angle side is suppressed. Further, when the condition (III-4) is satisfied, a shape can be ensured that is effective especially for compensation of distortion and astigmatism at a wide-angle limit.
- the object side surface is made aspheric. When the object side surface of the second lens element is made aspheric, off-axial aberration, especially, distortion and astigmatism at a wide-angle limit, can be compensated effectively.
- n 11 is a refractive index of the first lens element to the d-line
- n 12 is a refractive index of the second lens element to the d-line
- r 12 is a radius of curvature of the image side surface of the first lens element
- r 21 is a radius of curvature of the object side surface of the second lens element
- d is an optical axial distance between the image side surface of the first lens element and the object side surface of the second lens element
- f W is a focal length of the entire system at a wide-angle limit.
- the condition (5) is to be satisfied by the first lens element and the second lens element in the first lens unit.
- the value exceeds the upper limit of the condition (5) the thickness along the optical axis of the first lens unit increases, and hence difficulty arises in reduction of the overall length at the time of retraction. Thus, this situation is not preferable.
- the value exceeds the upper limit of the condition (5) compensation of various kinds of aberration on the off-axial ray, especially, astigmatism and distortion at a wide-angle limit, becomes insufficient. Thus, this situation is not preferable.
- the value goes below the lower limit of the condition (5) similarly, compensation of various kinds of aberration on the off-axial ray, especially, astigmatism and distortion at a wide-angle limit, becomes difficult. Thus, this situation is not preferable.
- n 11 is a refractive index of the first lens element to the d-line
- n 12 is a refractive index of the second lens element to the d-line
- r 12 is a radius of curvature of the image side surface of the first lens element
- r 21 is a radius of curvature of the object side surface of the second lens element
- d is an optical axial distance between the image side surface of the first lens element and the object side surface of the second lens element
- f T is a focal length of the entire system at a telephoto limit
- f W is a focal length of the entire system at a wide-angle limit.
- the condition (6) is to be satisfied by the first lens element and the second lens element in the first lens unit.
- the value exceeds the upper limit of the condition (6) the thickness along the optical axis of the first lens unit increases, and hence difficulty arises in reduction of the overall length at the time of retraction. Thus, this situation is not preferable.
- the value exceeds the upper limit of the condition (6) compensation of various kinds of aberration on the off-axial ray, especially, astigmatism and distortion at a wide-angle limit, becomes insufficient. Thus, this situation is not preferable.
- the value goes below the lower limit of the condition (6) similarly, compensation of various kinds of aberration on the off-axial ray, especially, astigmatism and distortion at a wide-angle limit, becomes difficult. Thus, this situation is not preferable.
- f G1 is a composite focal length of the first lens unit
- f W is a focal length of the entire system at a wide-angle limit.
- the condition (9) sets forth the focal length of the first lens unit.
- the optical power of the first lens unit becomes excessively weak.
- compensation of various kinds of aberration on the off-axial ray, especially, astigmatism and distortion at a wide-angle limit becomes insufficient.
- the effective diameter of the first lens unit need be increased.
- size reduction becomes difficult especially in a direction perpendicular to the optical axis. Accordingly, this situation is not preferable.
- the optical power of the first lens unit becomes excessively strong, and hence decentering error sensitivity between the first lens element and the second lens element in the first lens unit becomes high.
- f G2 is a composite focal length of the second lens unit
- f W is a focal length of the entire system at a wide-angle limit.
- the condition (10) sets forth the focal length of the second lens unit.
- the value exceeds the upper limit of the condition (10) the amount of movement of the second lens unit during the zooming need be excessively large. Thus, size reduction of the zoom lens system becomes difficult. Accordingly, this situation is not preferable.
- the focal length of the second lens unit becomes excessively short. This causes difficulty in aberration compensation for the entire variable magnification range. Thus, this situation is not preferable.
- f G3 is a composite focal length of the third lens unit
- f W is a focal length of the entire system at a wide-angle limit.
- the condition (11) sets forth the focal length of the third lens unit.
- the value exceeds the upper limit of the condition (11) the optical power of the third lens unit is reduced, and hence the amount of movement of the third lens unit increases. Thus, size reduction of the optical system becomes difficult. Accordingly, this situation is not preferable.
- the optical power of the third lens unit increases. This causes difficulty in compensation of spherical aberration and coma aberration in a variable magnification range where the third lens unit goes comparatively close to the object side. Thus, this situation is not preferable.
- f L1 is a focal length of the first lens element
- f W is a focal length of the entire system at a wide-angle limit.
- the condition (12) sets forth the focal length of the first lens element.
- the value exceeds the upper limit of the condition (12) compensation of various kinds of aberration on the off-axial ray, especially, astigmatism and distortion at a wide-angle limit, becomes insufficient. Thus, this situation is not preferable.
- the value goes below the lower limit of the condition (12) the positive optical power of the second lens element that constitutes the first lens unit need be increased, and hence difficulty arises in compensation of aberration generated in the first lens unit. Thus, this situation is not preferable.
- f L2 is a focal length of the second lens element
- f W is a focal length of the entire system at a wide-angle limit.
- the condition (13) sets forth the focal length of the second lens element.
- the value exceeds the upper limit of the condition (13) the Petzval sum increases excessively, and hence the curvature of field increases. Further, astigmatism also increases excessively. Thus, this situation is not preferable.
- the value goes below the lower limit of the condition (13) the negative optical power of the first entire lens unit becomes weak, and hence difficulty arises in achieving the size reduction of the zoom lens system. Thus, this situation is not preferable.
- f L1 is a focal length of the first lens element
- f G1 is a composite focal length of the first lens unit.
- the condition (14) sets forth the focal length of the first lens element.
- the value exceeds the upper limit of the condition (14) compensation of various kinds of aberration on the off-axial ray, especially, astigmatism and distortion at a wide-angle limit, becomes insufficient. Thus, this situation is not preferable.
- the value goes below the lower limit of the condition (14) the positive optical power of the second lens element that constitutes the first lens unit need be increased, and hence difficulty arises in compensation of aberration generated in the first lens unit. Thus, this situation is not preferable.
- f L2 is a focal length of the second lens element
- f G1 is a composite focal length of the first lens unit.
- the condition (15) sets forth the focal length of the second lens element.
- the value exceeds the upper limit of the condition (15) the Petzval sum increases excessively, and hence the curvature of field increases. Further, astigmatism also increases excessively. Thus, this situation is not preferable.
- the value goes below the lower limit of the condition (15) the negative optical power of the first entire lens unit becomes weak, and hence difficulty arises in achieving the size reduction of the zoom lens system. Thus, this situation is not preferable.
- f L1 is a focal length of the first lens element
- f L2 is a focal length of the second lens element.
- the condition (16) sets forth the ratio between the focal lengths of the first lens element and the second lens element.
- the value exceeds the upper limit of the condition (16) the optical power balance becomes unsatisfactory between the first lens element and the second lens element, and hence curvature of field and distortion increase. Thus, this situation is not preferable.
- the value goes below the lower limit of the condition (16) similarly, the optical power balance becomes unsatisfactory between the first lens element and the second lens element, and hence distortion occurs.
- the effective diameter of the first lens element need be increased. Thus, size reduction becomes difficult especially in a direction perpendicular to the optical axis. Thus, this situation is not preferable.
- the lens units constituting the zoom lens system of each embodiment are composed exclusively of refractive type lenses that deflect the incident light by refraction (that is, lenses of a type in which deflection is achieved at the interface between media each having a distinct refractive index).
- the lens type is not limited to this.
- the lens units may employ diffractive type lenses that deflect the incident light by diffraction; refractive-diffractive hybrid type lenses that deflect the incident light by a combination of diffraction and refraction; or gradient index type lenses that deflect the incident light by distribution of refractive index in the medium.
- a reflecting surface may be arranged in the optical path so that the optical path may be bent before, after or in the middle of the zoom lens system.
- the bending position may be set up in accordance with the necessity. When the optical path is bent appropriately, the apparent thickness of a camera can be reduced.
- This low-pass filter may be: a birefringent type low-pass filter made of, for example, a crystal whose predetermined crystal orientation is adjusted; or a phase type low-pass filter that achieves required characteristics of optical cut-off frequency by diffraction.
- FIG. 7 is a schematic construction diagram of a digital still camera according to Embodiments I-3, II-3 and III-3.
- the digital still camera comprises: an imaging device having a zoom lens system 1 and an image sensor 2 composed of a CCD; a liquid crystal display monitor 3 ; and a body 4 .
- the employed zoom lens system 1 is a zoom lens system according to Embodiment I-1, II-1 or III-1.
- the zoom lens system 1 comprises a first lens unit G 1 , a diaphragm A, a second lens unit G 2 and a third lens unit G 3 .
- the zoom lens system 1 is arranged on the front side, while the image sensor 2 is arranged on the rear side of the zoom lens system 1 .
- the liquid crystal display monitor 3 is arranged, while an optical image of a photographic object generated by the zoom lens system 1 is formed on an image surface S.
- a lens barrel comprises a main barrel 5 , a moving barrel 6 and a cylindrical cam 7 .
- the cylindrical cam 7 When the cylindrical cam 7 is rotated, the first lens unit G 1 , the second lens unit G 2 and the third lens unit G 3 move to predetermined positions relative to the image sensor 2 , so that magnification change can be achieved ranging from a wide-angle limit to a telephoto limit.
- the third lens unit G 3 is movable in an optical axis direction by a motor for focus adjustment.
- the digital still camera shown in FIG. 7 may employ any one of the zoom lens systems according to Embodiments I-2, II-2 and III-2.
- the optical system of the digital still camera shown in FIG. 7 is applicable also to a digital video camera for moving images. In this case, moving images with high resolution can be acquired in addition to still images.
- the above-mentioned zoom lens system according to Embodiments I-1 to I-2, II-1 to II-2 and III-1 to III-2 and an image sensor such as a CCD or a CMOS may be applied to a mobile telephone, a PDA (Personal Digital Assistance), a surveillance camera in a surveillance system, a Web camera, a vehicle-mounted camera or the like.
- a PDA Personal Digital Assistance
- a surveillance camera in a surveillance system a surveillance system
- a Web camera a vehicle-mounted camera or the like.
- Z h 2 / r 1 + 1 - ( 1 + k ) ⁇ ( h / r ) 2 + A ⁇ ⁇ 4 ⁇ ⁇ h 4 + A ⁇ ⁇ 6 ⁇ ⁇ h 6 + A ⁇ ⁇ 8 ⁇ ⁇ h 8 + A ⁇ ⁇ 10 ⁇ ⁇ h 10 + A ⁇ ⁇ 12 ⁇ ⁇ h 12 + A ⁇ ⁇ 14 ⁇ ⁇ h 14
- ⁇ is the conic constant.
- a 4 , A 6 , A 8 , A 10 , A 12 and A 14 are fourth, sixth, eighth, tenth, twelfth, fourteenth aspherical coefficients, respectively.
- FIG. 2 is a longitudinal aberration diagram of a zoom lens system according to Examples I-1, II-1 and III-1.
- FIG. 5 is a longitudinal aberration diagram of a zoom lens system according to Examples I-2, II-2 and III-2.
- each longitudinal aberration diagram shows the aberration at a wide-angle limit
- part (b) shows the aberration at a middle position
- part (c) shows the aberration at a telephoto limit.
- SA spherical aberration
- AST mm
- DIS distortion
- the vertical axis indicates the F-number (indicated as “F” in the figure)
- the solid line indicates the characteristics to the d-line
- the short dashed line indicates the characteristics to the F-line
- the long dashed line indicates the characteristics to the C-line.
- the vertical axis indicates the image height (indicated as “H” in the figure), and the solid line and the dashed line indicate the characteristics to the sagittal image plane (indicated as “s” in the figure) and the meridional image plane (indicated as “m” in the figure), respectively.
- the vertical axis indicates the image height (indicated as “H” in the figure).
- FIG. 3 is a lateral aberration diagram of a zoom lens system according to Examples I-1, II-1 and III-1 at a telephoto limit.
- FIG. 6 is a lateral aberration diagram of a zoom lens system according to Examples I-2, II-2 and III-2 at a telephoto limit.
- the three upper aberration diagrams correspond to a basic state where image blur compensation is not performed at a telephoto limit
- the three lower aberration diagrams correspond to an image blur compensation state where the entire second lens unit G 2 is moved with a predetermined amount in a direction perpendicular to the optical axis at a telephoto limit.
- the lateral aberration diagrams of the basic state the upper one shows lateral aberration at an image point of 70% of the maximum image height, the middle one shows lateral aberration at the axial image point, and the lower one shows lateral aberration at an image point of ⁇ 70% of the maximum image height.
- the upper one shows lateral aberration at an image point of 70% of the maximum image height
- the middle one shows lateral aberration at the axial image point
- the lower one shows lateral aberration at an image point of ⁇ 70% of the maximum image height.
- the horizontal axis indicates the distance from the principal ray on the pupil surface.
- the solid line indicates the characteristics to the d-line
- the short dashed line indicates the characteristics to the F-line
- the long dashed line indicates the characteristics to the C-line.
- the meridional image plane is adopted as the plane containing the optical axis of the first lens unit G 1 and the optical axis of the second lens unit G 2 .
- the amount of movement of the second lens unit G 2 in a direction perpendicular to the optical axis in the image blur compensation state at a telephoto limit is as follows.
- the amount of image decentering in a case that the zoom lens system inclines by 0.6° is equal to the amount of image decentering in a case that the entire second lens unit G 2 moves in parallel by each of the above-mentioned values in a direction perpendicular to the optical axis.
- the zoom lens systems of Numerical Examples I-1, II-1 and III-1 correspond respectively to Embodiments I-1, II-1 and III-1 shown in FIG. 1 .
- Table 1 shows the surface data of the zoom lens systems of Numerical Examples I-1, II-1 and III-1.
- Table 2 shows the aspherical data.
- Table 3 shows various data.
- the zoom lens systems of Numerical Examples I-2, II-2 and III-2 correspond respectively to Embodiments I-2, II-2 and III-2 shown in FIG. 4 .
- Table 4 shows the surface data of the zoom lens systems of Numerical Examples I-2, II-2 and III-2.
- Table 5 shows the aspherical data.
- Table 6 shows various data.
- Table I-7 shows values corresponding to the individual conditions in the zoom lens system of Numerical Examples I-1 to I-2.
- Table II-7 shows values corresponding to the individual conditions in the zoom lens system of Numerical Examples II-1 to II-2.
- Table III-7 shows values corresponding to the individual conditions in the zoom lens system of Numerical Examples III-1 to III-2.
- the zoom lens system according to the present invention is applicable to a digital input device such as a digital still camera, a digital video camera, a mobile telephone, a PDA (Personal Digital Assistance), a surveillance camera in a surveillance system, a Web camera or a vehicle-mounted camera.
- a digital input device such as a digital still camera, a digital video camera, a mobile telephone, a PDA (Personal Digital Assistance), a surveillance camera in a surveillance system, a Web camera or a vehicle-mounted camera.
- the present zoom lens system is suitable for an imaging optical system in a digital still camera, a digital video camera or the like that requires high image quality.
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Abstract
Description
5.0<αiW<20.0 (1)
n11≧1.9 (I-2)
5.0<αiW<20.0 (1)
n11≧1.9 (I-2)
5.0<αiW<20.0 (1)
n11≧1.9 (I-2)
5.0<αiW<20.0 (1)
(n 11−1)·(n 12−1)≧0.84 (II-2)
5.0<αiW<20.0 (1)
(n 11−1)·(n 12−1)≧0.84 (II-2)
5.0<αiW<20.0 (1)
(n 11−1)·(n 12−1)≧0.84 (II-2)
5.0<αiW<20.0 (1)
n12≧2.1 (III-2)
5.0<αiW<20.0 (1)
n12≧2.1 (III-2)
5.0<αiW<20.0 (1)
n12≧2.1 (III-2)
3.2<f T /f W (A)
ωW>35 (B)
ωW>38 (B)′
5.0<αiW<20.0 (1)
αiW<15.0 (1)′
n11≧1.9 (I-2)
0.8<(n 11−1)2<1.5 (I-3)
0.75<(n 11−1)·f W /r 12<1.2 (I-4)
(n 11−1)·(n 12−1)≧0.84 (II-2)
n12≧2.1 (III-2)
0.8<(n 12−1)2<1.5 (III-3)
0.4<(n 12−1)·f W /r 21<0.7 (III-4)
0.1<(n 11−1)·(n 12−1)·d·f W/(r 12 ·r 21)<0.3 (5)
0.15<(n 11−1)·(n 12−1)·d·f W/(r 12 ·r 21) (5)′
(n 11−1)·(n 12−1)·d·f W/(r 12 ·r 21)<0.25 (5)″
0.0001<(n 11−1)·(n 12−1)·d 2 ·f W/(r 12 ·r 21 ·f t)<0.04 (6)
2.4<|f G1 |/f W<4.0 (9)
|f G1 |/f W<3.0 (9)′
1.85<f G2 /f W<3.0 (10)
1.9<f G2 /f W (10)′
1.95<f G2 /f W (10)″
2.5<f G3 /f W<6.0 (11)
3.0<f G3 /f W (11)′
4.0<f G3 /f W (11)″
1.0<|f L1 |/f W<2.5 (12)
1.1<|f L1 |/f W (12)′
|f L1 |/f W<1.6 (12)″
2.0<f L2 /f W<5.0 (13)
2.4<f L2 /f W (13)′
f L2 /f W<4.0 (13)″
0.4<|f L1 |/|f G1|<0.8 (14)
0.45<|f L1 |/|f G1| (14)′
0.55<|f L1 |/|f G1| (14)″
0.85<f L2 /|f G1|<2.0 (15)
f L2 /|f G1|<1.8 (15)′
1.9<f L2 /|f L1|<3.0 (16)
2.0<f L2 /|f L1| (16)′
Here, κ is the conic constant. A4, A6, A8, A10, A12 and A14 are fourth, sixth, eighth, tenth, twelfth, fourteenth aspherical coefficients, respectively.
TABLE 1 |
(Surface data) |
Surface number | r | d | nd | vd | ||
Object surface | ∞ | ∞ | ||||
1 | 51.08500 | 1.10000 | 1.90001 | 34.5 | ||
2* | 6.68800 | 2.30000 | ||||
3* | 12.12200 | 1.75000 | 2.14001 | 17.0 | ||
4 | 21.50000 | Variable | ||||
5 (Diaphragm) | ∞ | 0.35000 | ||||
6* | 5.70000 | 1.58700 | 1.80470 | 41.0 | ||
7 | 29.04600 | 0.37500 | ||||
8 | 38.03700 | 1.04600 | 1.72916 | 54.7 | ||
9 | −16.50000 | 0.63000 | 1.76182 | 26.6 | ||
10 | 5.49100 | 0.70000 | ||||
11* | 17.68100 | 1.10000 | 1.66547 | 55.2 | ||
12 | −20.90300 | Variable | ||||
13* | 33.43600 | 1.60000 | 1.66547 | 55.2 | ||
14* | −49.83400 | Variable | ||||
15 | ∞ | 0.28000 | 1.51680 | 64.2 | ||
16 | ∞ | 0.50000 | ||||
17 | ∞ | 0.50000 | 1.51680 | 64.2 | ||
18 | ∞ | 0.37000 | ||||
19 | ∞ | 0.29815 | ||||
Image surface | ∞ | |||||
TABLE 2 |
(Aspherical data) |
Surface No. 2 | ||
K = −1.56675E+00, A4 = 4.70570E−04, A6 = 4.66416E−06, | ||
A8 = −9.97845E−07, A10 = 4.97712E−08, A12 = −1.08769E−09, | ||
A14 = 8.99770E−12 | ||
Surface No. 3 | ||
K = 0.00000E+00, A4 = 4.87626E−05, A6 = 2.01434E−06, | ||
A8 = −5.22735E−07, A10 = 2.72826E−08, A12 = −6.10198E−10, | ||
A14 = 5.12805E−12 | ||
Surface No. 6 | ||
K = 0.00000E+00, A4 = −2.23822E−04, A6 = 7.67079E−06, | ||
A8 = −2.43773E−06, A10 = 4.29726E−07, A12 = −3.98936E−08, | ||
A14 = 1.56912E−09 | ||
Surface No. 11 | ||
K = 0.00000E+00, A4 = −4.37904E−04, A6 = −5.27665E−05, | ||
A8 = 4.76568E−06, A10 = −6.52195E−07, A12 = 0.00000E+00, | ||
A14 = 0.00000E+00 | ||
Surface No. 13 | ||
K = 0.00000E+00, A4 = −1.10340E−04, A6 = 1.04396E−05, | ||
A8 = −6.20441E−07, A10 = 1.92500E−08, A12 = −2.48363E−10, | ||
A14 = 0.00000E+00 | ||
Surface No. 14 | ||
K = 0.00000E+00, A4 = 5.28184E−06, A6 = 1.04655E−07, | ||
A8 = −1.48869E−08, A10 = 0.00000E+00, A12 = 0.00000E+00, | ||
A14 = 0.00000E+00 | ||
TABLE 3 |
(Various data) |
Zooming ratio | 3.28506 | ||
Wide-angle | Middle | Telephoto | |||
limit | position | limit | |||
Focal length | 6.2096 | 13.2985 | 20.3990 | ||
F-number | 2.85034 | 4.26999 | 5.57319 | ||
View angle | 38.7767 | 19.5485 | 12.8788 | ||
Image height | 4.6750 | 4.6750 | 4.6750 | ||
Overall length | 40.4589 | 37.1496 | 40.0163 | ||
of lens system | |||||
BF | 0.09365 | −0.50369 | 0.29815 | ||
d4 | 16.6839 | 5.4283 | 1.5000 | ||
d12 | 3.5123 | 13.7570 | 21.2901 | ||
d14 | 5.9810 | 4.2800 | 2.7400 | ||
Entrance pupil | 8.6898 | 5.6601 | 3.8417 | ||
position | |||||
Exit pupil | −18.6236 | −51.4459 | −172.8086 | ||
position | |||||
Front principal | 12.8393 | 15.4870 | 21.8369 | ||
points position | |||||
Back principal | 34.2492 | 23.8511 | 19.6172 | ||
points position | |||||
Single lens data |
Lens | Initial surface | Focal | |
| number | length | |
1 | 1 | −8.6520 | |
2 | 3 | 22.1735 | |
3 | 6 | 8.5536 | |
4 | 8 | 15.9112 | |
5 | 9 | −5.3419 | |
6 | 11 | 14.5598 | |
7 | 13 | 30.3019 | |
8 | 15 | ∞ | |
9 | 17 | ∞ | |
Zoom lens unit data |
Initial | Overall | ||||
Lens | surface | Focal | length of | Front principal | Back principal |
unit | No. | length | lens unit | points position | points |
1 | 1 | −15.63371 | 5.15000 | −0.20747 | 1.18551 |
2 | 5 | 12.54975 | 5.78800 | −0.51799 | 1.29535 |
3 | 13 | 30.30192 | 1.60000 | 0.38874 | 1.02061 |
TABLE 4 |
(Surface data) |
Surface number | r | d | nd | vd | ||
Object surface | ∞ | ∞ | ||||
1 | 62.16200 | 1.10000 | 1.90001 | 34.5 | ||
2* | 6.69200 | 2.30000 | ||||
3* | 12.07300 | 1.75000 | 2.14001 | 17.0 | ||
4 | 21.50000 | Variable | ||||
5 (Diaphragm) | ∞ | 0.35000 | ||||
6* | 5.69200 | 1.58700 | 1.80470 | 41.0 | ||
7 | 32.03800 | 0.37500 | ||||
8 | 29.47800 | 1.04600 | 1.72916 | 54.7 | ||
9 | −16.01700 | 0.63000 | 1.76182 | 26.6 | ||
10 | 5.39900 | 0.70000 | ||||
11* | 18.61200 | 1.10000 | 1.66547 | 55.2 | ||
12 | −23.48300 | Variable | ||||
13* | 36.78300 | 1.60000 | 1.66547 | 55.2 | ||
14* | −48.34000 | Variable | ||||
15 | ∞ | 0.28000 | 1.51680 | 64.2 | ||
16 | ∞ | 0.50000 | ||||
17 | ∞ | 0.50000 | 1.51680 | 64.2 | ||
18 | ∞ | 0.37000 | ||||
19 | ∞ | 0.28717 | ||||
Image surface | ∞ | |||||
TABLE 5 |
(Aspherical data) |
Surface No. 2 | ||
K = −1.56154E+00, A4 = 4.68480E−04, A6 = 4.15258E−06, | ||
A8 = −1.01913E−06, A10 = 5.05982E−08, A12 = −1.06364E−09, | ||
A14 = 8.20851E−12 | ||
Surface No. 3 | ||
K = 0.00000E+00, A4 = 5.16820E−05, A6 = 1.33836E−06, | ||
A8 = −5.23000E−07, A10 = 2.76838E−08, A12 = −5.97362E−10, | ||
A14 = 4.65996E−12 | ||
Surface No. 6 | ||
K = 0.00000E+00, A4 = −2.38112E−04, A6 = 7.51411E−06, | ||
A8 = −2.40483E−06, A10 = 4.29616E−07, A12 = −4.01119E−08, | ||
A14 = 1.60238E−09 | ||
Surface No. 11 | ||
K = 0.00000E+00, A4 = −5.17367E−04, A6 = −5.66448E−05, | ||
A8 = 4.53807E−06, A10 = −7.50402E−07, A12 = 0.00000E+00, | ||
A14 = 0.00000E+00 | ||
Surface No. 13 | ||
K = 0.00000E+00, A4 = −6.25328E−05, A6 = 9.00851E−06, | ||
A8 = −7.82678E−07, A10 = 2.97351E−08, A12 = −4.15223E−10, | ||
A14 = 0.00000E+00 | ||
Surface No. 14 | ||
K = 0.00000E+00, A4 = 6.42897E−05, A6 = −4.19023E−06, | ||
A8 = 6.58934E−08, A10 = 0.00000E+00, A12 = 0.00000E+00, | ||
A14 = 0.00000E+00 | ||
TABLE 6 |
(Various data) |
Zooming ratio | 3.28135 | ||
Wide-angle | Middle | Telephoto | |||
limit | position | limit | |||
Focal length | 6.2142 | 13.1141 | 20.3911 | ||
F-number | 2.85258 | 4.28066 | 5.64291 | ||
View angle | 39.3679 | 19.8675 | 12.9178 | ||
Image height | 4.6750 | 4.6750 | 4.6750 | ||
Overall length | 39.3161 | 36.6808 | 39.7421 | ||
of lens system | |||||
BF | 0.25556 | −0.59241 | 0.28717 | ||
d4 | 15.8504 | 5.4283 | 1.5000 | ||
d12 | 3.0411 | 13.3769 | 21.0269 | ||
d14 | 5.9810 | 4.2800 | 2.7400 | ||
Entrance pupil | 8.3349 | 5.5693 | 3.7979 | ||
position | |||||
Exit pupil | −17.5453 | −46.5039 | −132.8723 | ||
position | |||||
Front principal | 12.3797 | 14.9375 | 21.0664 | ||
points position | |||||
Back principal | 33.1018 | 23.5667 | 19.3510 | ||
points position | |||||
Single lens data |
Lens | Initial surface | Focal | |
| number | length | |
1 | 1 | −8.4115 | |
2 | 3 | 21.9794 | |
3 | 6 | 8.3767 | |
4 | 8 | 14.3722 | |
5 | 9 | −5.2338 | |
6 | 11 | 15.7669 | |
7 | 13 | 31.6266 | |
8 | 15 | ∞ | |
9 | 17 | ∞ | |
Zoom lens unit data |
Initial | Overall | ||||
Lens | surface | Focal | length of | Front principal | Back principal |
unit | No. | length | lens unit | points position | points |
1 | 1 | −15.04135 | 5.15000 | −0.21859 | 1.17026 |
2 | 5 | 12.23158 | 5.78800 | −0.68230 | 1.21868 |
3 | 13 | 31.62659 | 1.60000 | 0.41827 | 1.05031 |
TABLE I-7 |
(Values corresponding to conditions) |
Numerical Example |
Condition | I-1 | I-2 |
(1) | αiW | 11.82 | 12.45 |
(I-2) | n11 | 1.90001 | 1.90001 |
(I-3) | (n11 − 1)2 | 0.810 | 0.810 |
(I-4) | (n11 − 1) · fW/r12 | 0.836 | 0.836 |
(5) | (n11 − 1) · (n12 − 1) · d · fW/(r12 · r21) | 0.181 | 0.182 |
(6) | (n11 − 1) · (n12 − 1) · d2 · fw/(r12 · r21 · fT) | 0.020 | 0.020 |
(9) | |fG1|/fW | 2.518 | 2.420 |
(10) | fG2/fW | 2.021 | 1.968 |
(11) | fG3/fW | 4.880 | 5.089 |
(12) | |fL1|/fW | 1.393 | 1.354 |
(13) | fL2/fW | 3.571 | 3.537 |
(14) | |fL1|/|fG1| | 0.553 | 0.559 |
(15) | fL2/|fG1| | 1.418 | 1.461 |
(16) | fL2/|fL1| | 2.563 | 2.613 |
TABLE II-7 |
(Values corresponding to conditions) |
Numerical Example |
Condition | II-1 | II-2 |
(1) | αiW | 11.82 | 12.45 |
(II-2) | (n11 − 1) · (n12 − 1) | 1.026 | 1.026 |
(5) | (n11 − 1) · (n12 − 1) · d · fW/(r12 · r21) | 0.181 | 0.182 |
(6) | (n11 − 1) · (n12 − 1) · d2 · fw/(r12 · r21 · fT) | 0.020 | 0.020 |
(9) | |fG1|/fW | 2.518 | 2.420 |
(10) | fG2/fW | 2.021 | 1.968 |
(11) | fG3/fW | 4.880 | 5.089 |
(12) | |fL1|/fW | 1.393 | 1.354 |
(13) | fL2/fW | 3.571 | 3.537 |
(14) | |fL1|/|fG1| | 0.553 | 0.559 |
(15) | fL2/|fG1| | 1.418 | 1.461 |
(16) | fL2/|fL1| | 2.563 | 2.613 |
TABLE III-7 |
(Values corresponding to conditions) |
Numerical Example |
Condition | III-1 | III-2 |
(1) | αiW | 11.82 | 12.45 |
(III-2) | n12 | 2.14001 | 2.14001 |
(III-3) | (n12 − 1)2 | 1.300 | 1.300 |
(III-4) | (n12 − 1) · fW/r21 | 0.584 | 0.587 |
(5) | (n11 − 1) · (n12 − 1) · d · fW/(r12 · r21) | 0.181 | 0.182 |
(6) | (n11 − 1) · (n12 − 1) · d2 · fw/ | 0.020 | 0.020 |
(r12 · r21 · fT) | |||
(9) | |fG1|/fW | 2.518 | 2.420 |
(10) | fG2/fW | 2.021 | 1.968 |
(11) | fG3/fW | 4.880 | 5.089 |
(12) | |fL1|/fW | 1.393 | 1.354 |
(13) | fL2/fW | 3.571 | 3.537 |
(14) | |fL1|/|fG1| | 0.553 | 0.559 |
(15) | fL2/|fG1| | 1.418 | 1.461 |
(16) | fL2/|fL1| | 2.563 | 2.613 |
Claims (43)
5.0<αiW<20.0 (1)
n11≧1.9 (I-2)
0.1<(n 11−1)·(n 12−1)·d·f W/(r 12 ·r 21)<0.3 (5)
0.8<(n 11−1)2<1.5 (I-3)
0.75<(n 11−1)·f W /r 12<1.2 (I-4)
0.0001<(n 11−1)·(n 12−1)·d 2 ·f W/(r 12 ·r 21 ·f t)<0.04 (6)
2.4<|f G1 |/f W<4.0 (9)
1.85<f G2 /f W<3.0 (10)
2.5<f G3 /f W<6.0 (11)
1.0<|f L1 |/f W<2.5 (12)
2.0<f L2 /f W<5.0 (13)
0.4<|f L1 |/|f G1|<0.8 (14)
0.85<f L2 /|f G1|<2.0 (15)
1.9<f L2 /|f L1|<3.0 (16)
5.0<αiW<20.0 (1)
n11≧1.9 (I-2)
0.1<(n 11−1)·(n 12−1)·d·f W/(r 12 ·r 21)<0.3 (5)
5.0<αiW<20.0 (1)
n11≧1.9 (I-2)
0.1<(n 11−1)·(n 12−1)·d·f W/(r 12 ·r 21)<0.3 (5)
5.0<αiW<20.0 (1)
(n 11−1)·(n 12−1)≧0.84 (II-2)
0.1<(n 11−1)·(n 12−1)·d·f W/(r 12 ·r 21)<0.3 (5)
0.0001<(n 11−1)·(n 12−1)·d 2 ·f W/(r 12 ·r 21 ·f t)<0.04 (6)
2.4<|f G1 |/f W<4.0 (9)
1.85<f G2 /f W<3.0 (10)
2.5<f G3 /f W<6.0 (11)
1.0<|f L1 |/f W<2.5 (12)
2.0<f L2 /f W<5.0 (13)
0.4<|f L1 |/|f G1|<0.8 (14)
0.85<f L2 /|f G1|<2.0 (15)
1.9<f L2 /|f L1|<3.0 (16)
5.0<αiW<20.0 (1)
(n 11−1)·(n 12−1)≧0.84 (II-2)
0.1<(n 11−1)·(n 12−1)·d·f W/(r 12 ·r 21)<0.3 (5)
5.0<αiW<20.0 (1)
(n 11−1)·(n 12−1)≧0.84 (II-2)
0.1<(n 11−1)·(n 12−1)·d·f W/(r 12 ·r 21)<0.3 (5)
5.0<αiW<20.0 (1)
n12≧2.1 (III-2)
0.1<(n 11−1)·(n 12−1)·d·f W/(r 12 ·r 21)<0.3 (5)
0.8<(n 12−1)2<1.5 (III-3)
0.4<(n 12−1)·f W /r 21<0.7 (III-4)
0.0001<(n 11−1)·(n 12−1)·d 2 f W/(r 12 ·r 21 ·f t)<0.04 (6)
2.4<|f G1 |/f W<4.0 (9)
1.85<f G2 /f W<3.0 (10)
2.5<f G3 /f W<6.0 (11)
1.0<|f L1 |/f W<2.5 (12)
2.0<f L2 /f W<5.0 (13)
0.4<|f L1 |/|f G1|<0.8 (14)
0.85<f L2 /|f G1|<2.0 (15)
1.9<f L2 /|f L1|<3.0 (16)
5.0<αiW<20.0 (1)
n12≧2.1 (III-2)
0.1<(n 11−1)·(n 12−1)·d·f W/(r 12 ·r 21)<0.3 (5)
5.0<αiW<20.0 (1)
n12≧2.1 (III-2)
0.1<(n 11−1)·(n 12−1)·d·f W/(r 12 ·r 21)<0.3 (5)
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WO2011001663A1 (en) * | 2009-07-02 | 2011-01-06 | パナソニック株式会社 | Zoom lens system, image pickup device and camera |
KR101925056B1 (en) | 2011-09-02 | 2018-12-04 | 삼성전자주식회사 | Zoom lens and photographing apparatus |
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